Brake mechanism.



H. A. CARPENTER d A. W. WARNER.

BRAKE MECHANISM.

APPLICATION HLED ocT. so. 1914.

p., Patente@ Mar. 7,19%.

3 SHEETS-SHEET?.

INVENTORS H. A. CARPENTER d A. W. WRNEH.

BRAKE MECHANISM.

APPLICATION man OCT. 3o, 1914.

HENRY A.

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ment of b1" bwkmg mum; Sq .surfac mechanisms are inclosed in a dust-proof oilconlining casing or chamber 17 here shown constructed as an extension of niotor end frame 3. The outer-side wall 1S' of the chamber is formed with the inwardly eX- tending circular guile 19, and slidable therein is the tubular neck portion 2O of the disk-pressing annular head 2l, the latter embracing the extremity of head 8 and engaging-the outermost brake disk as shown. Guide 19 is ofcup forni and combines with the cupped end of neck lO'in confining coiled spring The tendency of this spring is to expand andivhen unrestrained it operates to exert such pressure through head 21 on the nested disks as to set up a powerful braking action which when applied simultaneously with shutting ott the current from the motor causes the latter to coast to rest uniformly for all stops. and

with the amount of coast 'predetermined and provision made for "it, @overwinning is avoided, and the starting and stopping of any mechanisms dependent on or cordinated with the brake-applied mechanism are accurately timed.

In order to properly time the operations of the motor and brake so that the brake is inactive when the motor is energized and is rendered active when the motor is deenergized, an electrical device is utilized for actuating the disk pressing head 2l in opposition to spring said device deriving its energy from the source which supplies current to the motor so that it active only Whenthe motor is energized. In the present embodiment this electrical device is in the form of a solenoid 2l which may be mounted on chamber 1T, the conductors 26 for 'the solenoid being` connected to the motor conductors 2 at the reversing switch 28,showii conventionally in Fig. l. While a motor of three-phase type is shown, the invention is not limited thereto. The solenoid connections are such that the action of the solenoid is the same regardless of the direction of rotation of the motor.

A link Q9 connects the lower end of the solenoid core with one arm of bell-crank 30, the spindle. Si of the latter being .journaled in the bearing barrel formed in one side of chamber 17. The other extremity of bell-crank 2%() engages the upper extremity of the forked lever 34, the branches of which straddle neck 2U of the disk pressure head 2l, with trunnionlike pins 35 of the neck en gaged by said lever branches and with the lower extremities of the latter fulc 'finned on bearings lt'projecting inwardly from opposite sides of chamber 17. The 'l'.i'rked lever may be strengthened by connecting its lower extremities as indicated at il?. :i yoke connects the core of the solenoid with pistoii 39 of the dash pot 40, the yoke einbracing neck.v of pressure head 21. The downchainber- 51 in wall 18.

:aimer/s ln operation, when the. motor is denergized, the solenoid core is lowered both by gravity and by theT expansive action ofspring 23 transmitted through lever 3l; and bell-crank 3G, and the forward pressure of said spring holds head 21 pressed against the outermost friction diskaiid maintains the disks tightly interleaved in frictiongenerating engagement. As the motor and the solenoid have a common energy source7 the turning ott' of the current denergizes them simultaneously, and the resulting release and practically instantaneous operation of the brake serves to immediately stop the rotation of the motor shaft, the latter coasting to rest with a predetermined movement. that is uniform for all stops. When current is turned into the motor. the simultaneous energizing of solenoid 2l raises the core of the latter, thereby retraeting lever 3i -and with it pressure head 21 notwithstanding spring L3, thereby releasing the brake.

'lie apparatus is preferably so constructed tiat when the motor is running thereis a constant discharge'of oil onto the upper portions of the friction brake disks. and the oil outlet i.- is arranged Aat such an elevation in chamber 17 aste maintain the lower portions of all the disks submerged, and this.

constant and thorough lubrication facili tates the dissipation of heat generated in braking' and prevents the undue wearing of the disks.

Referring to the construction whereby the circulation of lubricant is maintained, outlet 41 of chamber 17 discharges into the depending reservoir ft2, and the outer walt of this reservoir and wall 1S of chamber 1T are formed with the upwardly extending port which is also cared horizontally through the top ofchamber 17 as indicated atliit, and port it has its outlelt t5 immediately above the brake disks. Port 43 is intersected by a pump which is operatively connected'to the motor shaft,by means of which when the motor is running there is a constant upward tioiv of oil in said port from reservoir 42, and hence a constant discharge thereof onto the disks. The oil circulating pump, for which no novelty per se is claimed herein, may be variously constructed. A. pump of etlicient i'orm is illustrated in Figs. S and 9 and con- -sists of a cylindrical head 46 which isf secured to a shaft 48,ithe.latter journaled in wall 18 and adapted to couple at t9 with the outer end of the motor shaft extension lflncircling head 46 is the sleeve-like cylinder 50 which is rotatable in the cylinc1 ,al The bore of mis cylinder is eccentric to the cylinder artis,

8. The cyiinder is prevented inakchamber l. through piston slot orA passage and-slidable Lirama 3;

ing a complete rotation by stop 52 projecting from its outer periphery vwhich is adapted to engage one or the other of pins 53 located at diametrically opposite sides of Head 6 is formed with a therein is the tivo-part piston Si, the opposite ends of which are held in constant engagement with the inner periphery of cylinder by spring lllhen the motor is runningin one direction the piston operatesto force oil upivardly around one side of head e@ through space or clearance 5G, Fig. 8. lf the direction of rotation is reversed, cylinder 50 is simply turned through half a `revolution by the reverse rotation of head i6. with stop 52 then located at the lefthand of Fig.

8 and with the oil passage or clearance extending around the righthand side of head lo. The motor thus reverses instantly with reversal of the motor shaft, and in either position of cylinder 50 its opposite ports 5T are in register with the oil port or passage i3 and the circulation of oil continues vvithout interruption.

lhile the invention is here shown applied to the motor shaft, it will be understood that an electric motor and electrically controlled brake actuating means forlmechanism driven by the motor may be variously arranged with a source of electrical energy common thereto whereby they are caused to operate simultaneously.

i. rilhe combination of rotatable and fixed elements, friction plates movably carried respectively by said elements,l plate-actuating means, an oil container, and means actuated by the rotatable elementfor causing oil to iloiv from the containeronto the plates.

2. rElie combination of an electric motor, interleaved friction-plate braking meansfor the rotor thereof, said means including a disk-moving device,a spring for normally moving said device in a direction to set the brake, a lever for retracting the spring-impelled device, a solenoid having its core operatii ely connected to the lever, and a. source of electrical energy common to the solenoid and to the motor.

3. The combination of an electric motor having an extended armature shaft, a friction disk brake applied to the shaft extension, an oil chamber inclosing the brake, the chamber having a port provided with an outletabove the disks, and oil circulating means for the port operatively connected to the motor shaft and brake actuating means.

4. The combination of an electric motor having an extended armature shaft, a friction brake device for the shaft extension, an oil chamber inelosing the brake device and having an oil circulating port adapted to discharge onto the brake device, oil circulating means actuated b v the armature shaft, brake-actuating means including a solenoid, and a source ofelectrical energy common to the motor and to the solenoid.

5. rihe combination of an electric motor, a brake for the rotor thereof consisting of non-rotatingfriction plates encircling the rotor and other friction plates associated with the first mentioned plates and secured to the rotor, a plate-compressing device arranged concentrieally with and movable. longitudinally of the rotor axis, a spring normally moving said device in direction to move the several plates toivard each other, a forked lever embracing said plate-compressing device and operatively connected thereto, a solenoid, a motion transmitting device interposed betweei the solenoid and said lever for actua""ng tne'latter to move the plate-compressini :levicfl in opposition to its spring when the a len, id energized, and means for simultaneously energizing the motor and solenoid and for simultaneously deenergizing the same.

' In testimony whereof We affix our signatures in presence of two Witnesses.

HENRY A. CARPENTER. ARTHUR Vif. WARNER Witnesses:

ADA M. STEELE, M. J. STEELE. 

